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Cario, L., Corraze, B., Meerschaut, A. & Chauvet, O. (2006) Dielectric breakdown and current switching effect in the incommensurate layered compound (LaS)(1.196)VS2. Phys. Rev. B, 73 155116.
Added by: Florent Boucher (2016-05-12 13:21:37) |
| Type de référence: Article DOI: 10.1103/PhysRevB.73.155116 Numéro d'identification (ISBN etc.): 1098-0121 Clé BibTeX: Cario2006 Voir tous les détails bibliographiques  |
Catégories: PMN Mots-clés: (las)(1.18)vs2, band-structure, charge, conduction, electronic-properties, localization, metal-insulator-transition, misfit compound, modulated structure, transport Créateurs: Cario, Chauvet, Corraze, Meerschaut Collection: Phys. Rev. B |
Consultations : 2/541
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| Résumé |
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A current switching effect of several orders of magnitude was observed in the incommensurate misfit layered compound (LaS)(1.196)VS2. This effect involves correlated vanadium t(2g) states in a hexagonal [VS2] layer. Application of moderate electric fields (similar to 50 V/cm) induces a dielectric breakdown and restores a metallic state. The large pretransitional nonlinearities are consistent with a Poole-Frenkel mechanism which highlights the role of Coulomb interactions. This behavior and the strong modulation of the vanadium atom positions, revealed by single crystal x-ray structure determination, are in favor of a heterogeneous charge distribution. With respect to recent theoretical works, we suggest that the current switching effect observed in (LaS)(1.196)VS2 is related to the breakdown of a remaining Mott insulator state.
Added by: Florent Boucher |